docs: Update README.md

Author: maximkrouk

README.md

@@ -1,3 +1,23 @@
 # combine-cocoa
 
-A description of this package.
+[![SwiftPM 5.3](https://img.shields.io/badge/swiftpm-5.3-ED523F.svg?style=flat)](https://swift.org/download/) ![Platforms](https://img.shields.io/badge/Platforms-iOS_13_|_macOS_10.15_|_tvOS_14_|_watchOS_7-ED523F.svg?style=flat) [![@maximkrouk](https://img.shields.io/badge/contact-@capturecontext-1DA1F2.svg?style=flat&logo=twitter)](https://twitter.com/capture_context) 
+
+Cocoa extensions for Apple Combine framework.
+
+### TODO
+
+- [x] CombineControlEvent
+- [x] CombineControlTarget
+- macOS
+ - [x] NSControl.ActionHandler
+- iOS
+ - [x] UIBarButtonItem
+ - [x] UICollectionView
+ - [x] UIControl
+ - [x] UIGestureRecognizer
+ - [x] UIScrollView
+ - [x] UISearchBar
+ - [x] UITableView
+ - [x] UITextView
+ - [x] Keyboard
+ - [x] AnimatedAssignSubscriber (_might be improved_)